CS120A Atmospheric Visibility Sensor

Compared to many such sensors, the CS120A design means that visibility is being measured in a relatively clean space because the position of the heads and body minimize disturbance of the airflow at the measurement volume. 

The CS120A uses continuous high-speed sampling, which improves the accuracy of the measurements taken during mixed weather such as rain and hail, while providing reliable readings during more stable events such as fog and mist. High-speed sampling also allows the sensor to better respond to suddenly changing conditions. 

The CS120A has several design features that keep its optics clean. Downward-facing optics minimize dirt and snow buildup. Low-powered heaters prevent the formation of dew, and a higher-powered heater prevents the formation of ice. 

The sensor is very power efficient, drawing just 3 W during normal operation including the dew heaters; power can be reduced further by reducing the sample rate and manual control of the heaters. 

Two configurable alarm outputs are provided and, via relays, these can drive external warning systems such as lights and foghorns. They can also be used to switch the intensity of wind turbine warning lights depending upon current visibility levels. 

Benefits and Features 

• • High performance sensor at a competitive price 
  • Sensor design minimizes airflow disruption at measurement volume 
  • Incorporates automatic dew and hood heaters for all-weather operation 
  • Simple field calibration using optional calibration kit 
  • Low power—suitable for remote application 
  • Automatic status check for faults or window contamination 
  • Type certified for aviation use by the German Meteorological Service, Deutscher Wetterdienst (DWD)